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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 755.5	$ 330.8	$ 131.6
Changes in foreign currency translation adjustment	7.6	(10.4)	(11.0)
Loss recognized in accumulated other comprehensive income (loss)	2.3	(1.1)	(2.0)
Net (gains) losses reclassified from accumulated other comprehensive income to the statement of income	(2.4)	(6.1)	0.0
Changes in pension plans, net of taxes of $1.1 in 2017, $0.3 in 2016, and $0.3 in 2015	0.9	(0.7)	(0.2)
Loss recognized in other comprehensive income, net	0.8	(3.4)	(3.9)
Loss reclassified from accumulated other comprehensive income to the statement of operations, net	6.9	3.9	0.0
Other comprehensive income (loss)	16.1	(17.8)	(17.1)
Comprehensive income	$ 771.6	$ 313.0	$ 114.5

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